When adding a sample series, the sample series name will be identical to the sample name. In case a number is added as a prefix or suffix to the sample name, the sample series will be named accordingly (e.g. if a sample series of 6 samples is added in which samples are numbered 1,2,3,4,5,6 the sample series will be named as sample name 1-6). In case you want to change the name of the samples series you can rename the sample series. Open the sample series information sheet and click on Rename.

In the appeared popup, you can change the series name and confirm by clicking on Rename.

Note that only the name of the sample series will be updated in this way and not the names of the samples. These should be updated separately by updating the sample.